I've recently upgraded from the 3.5.7 kernel to the 3.7.10-r1 kernel and my usb wireless adapter is no longer connecting. When I plug it in it still shows all of my neighbor's access points, but when I try and connect to mine network manager shows the two lit up dots like it's about to complete the connection. It stays like this for a while and then says disconnected. It will then instantly try and reconnect, fail, and loop over again. The device in question is a Linksys AE1000 with a Ralink chip in it.

You are probably in need of a kernel with proper ehci support, later 3.7 kernels reported to have problems
either
add =sys-kernel/gentoo-sources-3.9.0 to /etc/portage.keywords to advance to a newer testing branch kernel (recommended)
or
add >sys-kernel/gentoo-sources-3.6.11-r2 to /etc/portage/package.mask to revert to an older kernel (less recommended)
then
emerge gentoo-sources

you have changed all wlan0 to the new nomenclature?_________________Defund the FCC.

I haven't manually changed anything to the new nomenclature. After you were able to help me get udev working again I noticed that my wired connection had changed names. I will switch to 3.9 then and report back on my findings.

You are definitely right about the EHCI issue. If I boot up and I don't have my ethernet cable plugged in network manager keeps trying and failing to connect to my ethernet connection.

what networking are you attempting? networkmanager --now I see it.
you have emerged wpa_supplicant and (dhcp or dhcpcd)?
networkmanager is in the boot run level? net.wlan0, net.wlp0s19f2u6, wpa_supplicant, dhclient, and dhcpcd are not in any run level?
the networkmanager gui sees the wlan0 interface?_________________Defund the FCC.

what networking are you attempting? networkmanager --now I see it.
you have emerged wpa_supplicant and (dhcp or dhcpcd)?
networkmanager is in the boot run level? net.wlan0, net.wlp0s19f2u6, wpa_supplicant, dhclient, and dhcpcd are not in any run level?
the networkmanager gui sees the wlan0 interface?

Implies that NetworkManager can not scan your access point while at the same time it can scan more than one of your neighbor's?
Are you using a GUI or CLI to scan your neighbors AP's?
does iwlist scan show your AP and ypur neighbors?

Code:

emerge iw
iw wlan0 scan

does ifconfig still show an ipv6 address?
do you have a log at /var/log/NetworkManager.log?
What are the contents of: (wgetpaste could help)
/etc/NetworkManager/NetworkManager.conf
/etc/NetworkManager/system-connections
/etc/NetworkManager/dispatcher.d_________________Defund the FCC.

Implies that NetworkManager can not scan your access point while at the same time it can scan more than one of your neighbor's?
Are you using a GUI or CLI to scan your neighbors AP's?
does iwlist scan show your AP and ypur neighbors?

Code:

emerge iw
iw wlan0 scan

does ifconfig still show an ipv6 address?
do you have a log at /var/log/NetworkManager.log?
What are the contents of: (wgetpaste could help)
/etc/NetworkManager/NetworkManager.conf
/etc/NetworkManager/system-connections
/etc/NetworkManager/dispatcher.d

/usr/sbin/iw wlan0 scan is showing all of my neighbor's access points. Yes, I'm running NetworkManager through the tray icon gui and not over command line.

ifconfig is still showing an ipv6 address for wlan0 which is very strange since I disabled ipv6. I don't have a network manager log there.

# Call rc-service in background mode so that the start/stop functions update
# NetworkManager service status to started or inactive instead of actually
# starting or stopping the daemon
export IN_BACKGROUND=YES

After a few frustrating hours of converting my wicd system to network manager (unsuccessfully) and restoring wicd (hard, frustrating, but ultimately successful) I changed course and shifted a vanilla gentoo style networking system to networkmanager. Easy success. As soon as I rebooted and started Gnome I got a large notification that wireless networks were available. A click on the icon showed a couple of my neighbors networks and 2 of my own.from their All I had to do was pick one and enter my PSK code. Seem familiar?

After a few frustrating hours of converting my wicd system to network manager (unsuccessfully) and restoring wicd (hard, frustrating, but ultimately successful) I changed course and shifted a vanilla gentoo style networking system to networkmanager. Easy success. As soon as I rebooted and started Gnome I got a large notification that wireless networks were available. A click on the icon showed a couple of my neighbors networks and 2 of my own.from their All I had to do was pick one and enter my PSK code. Seem familiar?

Code:

grep -i networkmanager /var/log/messages

will show your networkmanager "log"

I'm not exactly certain what you're saying. Are you saying this is a network manager problem in general? I tried clearing my stored password and reconnecting along with trying to connect to other networks with my password but neither of them worked.

Also, I've noticed if I unplug my ethernet cable and try and replug it in it also scans that multiple times trying to connect, but it can't. I'm thinking now this is a general problem with my network stack but I'm not certain where it is. Here's the dmesg of an attempt to reconnect: